I stayed there around two weeks ago during my first trip to Bangkok and found it really nice. The location is good if you like NEP which is a quick 5 minute walk away or fancy a BJ at Lolitas which is like a 2 minute walk. I stayed in the basic studio deluxe room which was big and more than adequate for my needs. Good bed, good air con, and universal outlets saved me from having to buy a power adapter for my laptop. The pool looked nice though I didn't use it. The gym was pretty small with dumb bells and some cardio machines but had good air conditioning.
There is no joiner fee (not sure about multiple girls, I only took one at a time). The staff never checked, nor took my girls ID. Up to you whether that is a positive or negative. Your key only allows you to go to the floor that your room is on or to the common areas (pool, gym).
There were a few small negatives that didn't bother me too much but might matter more to some. For my room at least, internet wasn't free. I can't recall the price but you can choose to pay by the hour, for 24 hours, or other higher options. I only paid 24 hours at a time and the meter is constant whether you are logged in or not. The higher priced rooms come with free internet usage I believe.
There is construction going on on a building nearby and the noise was enough to bother me and one of my bar fines early one morning.
The only issue that bothered me really to any degree was the shower. The way the tub is set up, the water when you shower runs along the edges and onto the floor. Every time you take a shower the floor around the tub and toilet gets covered in water. There is a drain right behind the toilet but it's still annoying.
Other than those minor things I enjoyed my stay and would not hesitate to book a room at Phachara Suites again.
